I also had this problem with my NASA wind. The shaft, which had broken flush, is moulded into the plastic housing and not normally supplied but when I phoned NASA the kind person sent me a new rotor, a new shaft plus a few of the spring clips that hold the rotor onto the shaft. They only charged for the rotor. I managed to get the broken piece of shaft out and Araldited in the new shaft.The cups and shaft of the masthead wind instrument have gone on vacation. There is no manufacturer’s name on the unit for me to get spares. Does anyone recognise it? Many thanks in anticipation.
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Yes, it says Navman, but looking online the masthead unit is completely different. The previous owner might have mixed and matched - if that is remotely possible.NASA
Is there not a display somewhere ?